Add prompt stash via long-press on send button

Wisp/ViewModels/ChatViewModel.swift

@@ -62,6 +62,7 @@ final class ChatViewModel {
     private var usedResume = false
     var queuedPrompt: String?
     var queuedAttachments: [AttachedFile] = []
+    var stashedDraft: String?
     private var retriedAfterTimeout = false
     private var turnHasMutations = false
     private var pendingForkContext: String?
@@ -210,6 +211,19 @@ final class ChatViewModel {
         try? modelContext.save()
     }
 
+    func stashDraft() {
+        let text = inputText.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !text.isEmpty else { return }
+        stashedDraft = text
+        inputText = ""
+    }
+
+    private func restoreStash() {
+        guard let stash = stashedDraft else { return }
+        stashedDraft = nil
+        inputText = stash
+    }
+
     func fetchRemoteSessions(apiClient: SpritesAPIClient, existingSessionIds: Set<String>) {
         guard !isLoadingRemoteSessions else { return }
         isLoadingRemoteSessions = true
@@ -479,12 +493,14 @@ final class ChatViewModel {
             queuedPrompt = text
             queuedAttachments = attachedFiles
             attachedFiles = []
+            restoreStash()
             return
         }
 
         // Build prompt with attached file paths prepended
         let prompt = buildPrompt(text: text, attachments: attachedFiles)
         attachedFiles = []
+        restoreStash()
 
         let isFirstMessage = messages.isEmpty
         let userMessage = ChatMessage(role: .user, content: [.text(prompt)])

Wisp/Views/SpriteDetail/Chat/ChatInputBar.swift

@@ -13,6 +13,7 @@ struct ChatInputBar: View {
     var attachedFiles: [AttachedFile] = []
     var onRemoveAttachment: ((AttachedFile) -> Void)? = nil
     var lastUploadedFileName: String? = nil
+    var onStash: (() -> Void)? = nil
     var isFocused: FocusState<Bool>.Binding
 
     @State private var showStopConfirmation = false
@@ -93,6 +94,13 @@ struct ChatInputBar: View {
                 .tint(isEmpty || hasQueuedMessage ? .gray : Color("AccentColor"))
                 .disabled(isEmpty || hasQueuedMessage)
                 .buttonStyle(.glass)
+                .contextMenu {
+                    if let onStash, !isEmpty {
+                        Button("Stash Draft", systemImage: "tray.and.arrow.down") {
+                            onStash()
+                        }
+                    }
+                }
             }
         }
         .animation(.easeInOut(duration: 0.2), value: attachedFiles.count)

Wisp/Views/SpriteDetail/Chat/ChatView.swift

@@ -148,6 +148,7 @@ struct ChatView: View {
                         viewModel.attachedFiles.removeAll { $0.id == file.id }
                     },
                     lastUploadedFileName: viewModel.lastUploadedFileName,
+                    onStash: { viewModel.stashDraft() },
                     isFocused: $isInputFocused
                 )
             }
@@ -244,3 +245,17 @@ struct ChatView: View {
         .background(.bar)
     }
 }
+
+#Preview {
+    let viewModel = ChatViewModel(
+        spriteName: "my-sprite",
+        chatId: UUID(),
+        currentServiceName: nil,
+        workingDirectory: "/home/sprite/project"
+    )
+    NavigationStack {
+        ChatView(viewModel: viewModel)
+            .environment(SpritesAPIClient())
+            .modelContainer(for: [SpriteChat.self, SpriteSession.self], inMemory: true)
+    }
+}

WispTests/ChatViewModelTests.swift

@@ -601,4 +601,60 @@ struct ChatViewModelTests {
 
         #expect(vm.currentAssistantMessageId == nil)
     }
+
+    // MARK: - stashDraft
+
+    @Test func stashDraft_movesInputTextToStash() throws {
+        let ctx = try makeModelContext()
+        let (vm, _) = makeChatViewModel(modelContext: ctx)
+
+        vm.inputText = "my long prompt"
+        vm.stashDraft()
+
+        #expect(vm.stashedDraft == "my long prompt")
+        #expect(vm.inputText == "")
+    }
+
+    @Test func stashDraft_doesNothingWhenEmpty() throws {
+        let ctx = try makeModelContext()
+        let (vm, _) = makeChatViewModel(modelContext: ctx)
+
+        vm.inputText = "   "
+        vm.stashDraft()
+
+        #expect(vm.stashedDraft == nil)
+        #expect(vm.inputText == "   ")
+    }
+
+    @Test func stashDraft_overwritesPreviousStash() throws {
+        let ctx = try makeModelContext()
+        let (vm, _) = makeChatViewModel(modelContext: ctx)
+
+        vm.inputText = "first draft"
+        vm.stashDraft()
+        vm.inputText = "second draft"
+        vm.stashDraft()
+
+        #expect(vm.stashedDraft == "second draft")
+        #expect(vm.inputText == "")
+    }
+
+    @Test func stashDraft_leavesInputReadyForNextMessage() throws {
+        let ctx = try makeModelContext()
+        let (vm, _) = makeChatViewModel(modelContext: ctx)
+
+        vm.inputText = "long prompt I want to come back to"
+        vm.stashDraft()
+
+        // After stashing, the field is clear and stash holds the draft
+        #expect(vm.inputText == "")
+        #expect(vm.stashedDraft == "long prompt I want to come back to")
+
+        // Manually simulate the restore (as sendMessage would do)
+        vm.inputText = vm.stashedDraft!
+        vm.stashedDraft = nil
+
+        #expect(vm.inputText == "long prompt I want to come back to")
+        #expect(vm.stashedDraft == nil)
+    }
 }